63945647 has 4 divisors (see below), whose sum is σ = 63995376. Its totient is φ = 63895920.

The previous prime is 63945617. The next prime is 63945649. The reversal of 63945647 is 74654936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63945647 - 2⁸ = 63945391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63945598 and 63945607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63945649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22883 + ... + 25524.

It is an arithmetic number, because the mean of its divisors is an integer number (15998844).

Almost surely, 2^63945647 is an apocalyptic number.

63945647 is a deficient number, since it is larger than the sum of its proper divisors (49729).

63945647 is a wasteful number, since it uses less digits than its factorization.

63945647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49728.

The product of its digits is 544320, while the sum is 44.

The square root of 63945647 is about 7996.6022159415. The cubic root of 63945647 is about 399.8867325126.

The spelling of 63945647 in words is "sixty-three million, nine hundred forty-five thousand, six hundred forty-seven".